The single most important issue with this topic is that vitamin B12 which is super essential for the human body to function properly can...

The average person needs around 120 grams of protein per day to fill the requirements that the body demands

The single most important issue with this topic is that vitamin B12 which is super essential for the human body to function properly can only be found in meat which is important for our body’s and for athletes as it affects the production of red blood cells. In today’s market many cereals and oats are fortified with vitamin B12 and B12 supplements can be found most anywhere but keep in mind that these synthetic vitamins do not have the same positive effect on the body than raw and natural vitamins and the companies who own these vitamin and supplement companies may have altered the chemical composition of their vitamins and supplements so that they contain little or no actual nutrition.
Maybe your the kind of vegan who is just disgusted with the way raw meat looks or has fallen for all the inflated publicity in the media that meat is deadly and its fat can cause heart attacks and that it takes 6 months for raw meat to pass through your bowels (which is pure lies as it passes through your bowels a whole lot easier than those Cheetos and Oreo cookies that you treat yourself too once in a while).
The average person needs around 120 grams of protein per day to fill the requirements that the body demands and needs from vitamin B12. There are those hardcore vegans out there that think that they can safely live on a diet on pure veggies but the human body needs actual vitamin B12 to function properly and keep you healthy. For the record plants do not produce vitamin B12 and are not sources of this vitamin B12. the lacto-ovo vegetarian can obtain this vitamin from eggs and dairy products but for the hardcore strictly veggie vegetarian they are out of luck as they have to eat some flesh dwelling milk of meat to get the proper nutrition for optimal body performance. Remember that vitamin B12 is found only in animal tissue.
There have been various test done on rats being fed only one source of protein per day like corn but they did not get the required amounts of powerful amino acids.
One question asked by a reader was if being a vegan helped in losing weight? The answer is clearly no as vegetarians seem to weigh less than meat eaters but that may be the result of the vegetarians own eating habits. I have seem many overweight vegetarians as they still eat snickers bars and drink soda thinking that it will do them no harm.